No, it's not that all games have similar ideas. This is the same developer recycling the same game over and over again with a different wrapper as a cash grab. Zero innovation.
King of Avalon, State of Survival, Guns of Glory, Realm of Mystery, Whiteout, Dark Survival, Kingshot, and the list literally goes on forever. It's the same exact game by the same group of Chinese developers.
FunPlus, Century Games, and a few other names, but basically the same exact company.